“In using the terms play and playfulness, I do not intend to suggest any lack of seriousness; quite the contrary. Anyone who has watched children, or adults, at play will recognize that there is no contradiction between play and seriousness, and that some forms of play induce a measure of grave concentration not so readily called forth by work.”
Source : Richard Hofstadter (2012). “Anti-Intellectualism in American Life”, p.30, Vintage